BMW 3 Series useful guides
Lubrication
What is the purpose of the motor oil of your 3 Series?
What engine oil does your 3 Series need?
When do I have to change the motor oil of my 3 Series?
How much motor oil does your 3 Series need?
Transmission fluid
What is the transmission fluid of your 3 Series, and when should you change it?
When should you change the differential fluid of your 3 Series?
How much transmission fluid does my 3 Seriesneed?
What kind of transmission fluid does your 3 Series take?
OBD codes
What is the error code OBD II P0106?
Symptoms of your 3 Series‘s error code P0340
Electrical system
How to test your 3 Series‘s battery, step by step
How do I start my 3 Series with a dead battery?
Air conditioner
Which refrigerant do you need for the air conditioner of your 3 Series?
How does the air conditioner of your 3 Series work?
Why is the air conditioner of my 3 Series not working properly?
Other guides
Booster seats for children in your 3 Series: all you need to know
How to keep your 3 Series safe during extended periods without use
What do the technical specifications of your 3 Series’s engine mean?
What should you check on your 3 Series before a road trip?
What is the IAC valve of your 3 Series?
Exhaust smoke and its colors on a 3 Series: causes and severity
What styles of car bodies exist?
What is a fuse and what types can you find for your 3 Series?
What light bulbs fit your 3 Series?
Spark plugs
What kinds of spark plugs are there?
What kind of spark plugs does your 3 Series need?
What are spark plugs?
How do I change the spark plugs of my 3 Series?
Maintenance
What is the timing belt on a 3 Series?
What filters exist in your 3 Series and when should you replace them?
What is the serpentine belt of your 3 Series and when should you change it?
What is brake fluid and which one should you use for your 3 Series?
Warning lights
Why is the oil light on?
Why does your 3 Series’s engine overheat? Causes and solutions
What is the immobilizer on a 3 Series? Why does it fail?
What does the check engine light of your 3 Series mean?
Fuel
What is the fuel octane rating?
How to improve the fuel consumption of your 3 Series
Which type of fuel should you use in your 3 Series?
What are biofuels?
What types of fuel exist?
Steering fluid
What power steering fluid does your 3 Series need?
How to change the power steering fluid of your 3 Series?
Wheels
What kind of information is engraved in the tires of your 3 Series?
How to rotate the tires of your 3 Series?
What is the right tire pressure for your 3 Series?
How to change one of your 3 Series‘s wheels?
Sensors
What is the Throttle Position Sensor (TPS) of your 3 Series?
What is the MAP sensor of your 3 Series?
What is the oxygen sensor (or lambda sensor) of your 3 Series?
Airbags
How do your 3 Series‘s airbags work? What precautions should you take with them?
